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COMMITTMENTS AND CONTINGENCIES: (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Garcia Ataucuri litigation
plaintiff
Dec. 31, 1992
Peru
Dec. 31, 1978
Peru
Dec. 31, 1971
Peru
Mar. 31, 2012
Peru
Agreements expiring during 2012
union
Mar. 31, 2012
Peru
Agreements expiring on August 31, 2012
union
Mar. 31, 2012
Peru
Agreements expiring in November 2012
union
May 31, 2011
Peru
Garcia Ataucuri and Others against SCC's Peruvian Branch
person
Apr. 30, 1996
Peru
Garcia Ataucuri and Others against SCC's Peruvian Branch
person
Mar. 31, 2012
Peru
Garcia Ataucuri and Others against SCC's Peruvian Branch
solesdeoro
Aug. 31, 2009
Peru
Exploraciones de Concesiones Metalicas S.A.C. ("Excomet")
Mar. 31, 2012
Mexican Operations.
union
Feb. 19, 2010
Mexican Operations.
Pasta de Conchos Accident
person
Litigation matter                          
Number of widows of miners who filed the complaint                         3
Number of former employees who filed the complaint               216 900        
Statutory participation of mine workers in pre-tax profit (as a percent)   8.00%   10.00%                  
Statutory participation of mine workers in pre-tax profit paid in cash (as a percent)   100.00% 4.00% 40.00%                  
Statutory participation of mine workers in pre-tax profit received as equity interest of enterprise (as a percent)       60.00%                  
Percentage of pre-tax profits delivered as "labor shares"     5.50%                    
Damages sought by the plaintiff                   38,763,806.80 "labor shares" (acciones laborales) (or 3,876,380,679.56 "soles de oro") to be issued under the former profit sharing law proportionally to each former employee in accordance with the time of employment of such employee with SCC's Branch in Peru, plus dividends      
Face value of one labor share                   100.00      
Plantiffs do not represent the percent of SCC's eligible employees                   100.00%      
Soles de oro equivalent to today's one nuevo sol                   1,000,000,000      
Purchase price of shares paid to former stockholders                     $ 2    
Number of labor unions         8 3 1         3  
Number of plaintiffs involved in lawsuits filed 800